Do even the smallest clouds simply drift with the wind? This question is at the heart of the recently funded ERC Starting Grant project CloudBrake, which strives to understand the impact of momentum transport by cumulus convection on large-scale patterns of winds. CloudBrake's goal is to expose relationships between clouds and winds to estimate the amount of cumulus friction in different boundary layer flows, which is important for numerical weather prediction, climate modelling, and wind energy design.